横观各向同性岩体地基中赋存裂纹断裂力学分析

采用无双材料对偶边界元方法分析了半无限横观各向同性岩体地基中赋存的正方形裂纹，裂纹面上作用着法向均布力，横观各向同性岩体地基的各向同性面平行于半无限域自由面。数值计算得到了该类裂纹的应力强度因子值。根据数值结果讨论了横观各向同性岩体地基弹性参数、裂纹面对各向同性面的倾角赋存裂纹应力强度因子的影响。结果表明，岩体地基弹性系数、裂纹面对各向同性面的倾角对裂尖应力强度因子有明显影响。在弹性系数中，弹性模量对应力强度因子的影响最为敏感。

Fracture Mechanics Analysis of Square Crack in Transversly Isotropic Rock Foundation

The square cracks in a transversely isotropic rock foundation are analyzed here by using the dual boundary ele- ment method（DBEM）. The crack faces are subjected to the normal and tangential uniformly-distributed loads respective- ly, and the isotropic surfaces are parallel to half-space surfaces. The stress intensity factor （SIF） values associated with this kind of square crack are calculated from the crack opening displacements. According to the numerical results, the ef- fects of the elastic coefficients in the transversely isotropic material and the inclination angle between the crack surface and isotropic plane on the SIF values are discussed. The results show that the above two factors such as the elastic coeffi- cients and crack surface have abvious effects on the SIF values, and in the elastic coefficients, the effect of elastic modu- lus on the SIF values is most sensitive.